Okay, so this is an interesting and useful juncture, as I have a Thing of the Internet. Having done an evaluation of the $40 delta between "decent smoke/CO detector" and "Nest Protect" I went with the talky glowy motion-sensory choice. I do not regret this purchase as having something say "Heads up! There's smoke in the hallway! Get over here and shut me up in ten seconds or I'll scream at you!" beats the shit out of instantaneous loud beeping. BUT I am conscious that it is an internet appliance, constantly hooked up to the Web, with more telemetry than I'm using (or allowed to use). I also know that the configuration utility presented to me cares precious little about security. So... how can I check what Mr. Nest is saying about my house? How can I check to see what it's putting on my network? As there's no camera on it and (so far as I know) no microphone, I do not believe it presents much of a security risk, but I also suspect it's sharing more than it's telling me.